Coherer.



P. G. SARGENT.

COHERER.

APPLICATION FILED MAY 15 1908 Patented Jan. 5, 1909.

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UNITED STATES PATENT- oFFro FREDERICK G. SARGENT, OF WESTEORD, MASSACHUSETTS.

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Specification of Letters Patent. Application filed May 15, 1908. Serial No. 433,10!.

Patented Jan. 5, 1909.

To all whom it may concern:

Be it known that- I, FREDERIOK'G. SAR- GENT, a citizen of the United States, residing at Westford, in the county of Middlesex and State of Massachusetts, have invented a new and useful Coherer, of which the following is a s ecification.

his invention constitutes an improvement over my previous invention set forth in my Patent No. 883,241 granted March 31, 1908, and relates to a coherer for wireless tele aphy and the like. u

T e principal objects of the invention are to provide an improved form of coherer in which the parts are held together resiliently in a simple and convenient manner and to improve the cohering material in such a way that the de-coherenceof the same may be greatly facilitated.- Further objects and advantages of themtestis-twin ap hereinafter-I" Reference is tobe had to theaccompaniyini drawing which shows a side elevation o a" co erer part1 in section constructed in ac cordance wit this inventioif;

This drawing shows the invention constructed in a form in which, 'on anon-conducting base 10, are mounted a pair of metallic supports or brackets lib-12. bracket 11 is a diskorplate 13 preferably of carbon. On the other bracket is mounted an adjusting screw 14 which enga es the end of the other electrode 15 preferab y made of metal, as for exam le steel. The electrode 15 is provided wit a reduced portion'lfi which constitutes a plug on which is mounted a tube or cylinderl? of rigid non-conducting material, preferabl glas's. Elastic means is provided, preferab y in the form of a spring.

18, bearing on a shoulder'on the electrode 15 and on the end of the glass tube for. forcing the plug and tube apart against thejadjustin screw-1 1 and holding theend of theglas's.

tu e against the face of the disk or plate 13. The end of the plug may be either fiat or pointed and maybear directly on the plate 13 without any cohering particles between.

In the space between the end of the lug 16 and the face of the glass disk is locate the cohering material 20 when that is used. This material preferably consists of a mixture of twoor more kinds of. fine particles some of which are preferably conducting and others non-conductin The conducting articles may convenient y be made of meta as for example zinc, and the other particles are On the ducting cylinder or tube on the plug proiiector; plate, an adjustable conducting preferably formed of rubber so that they will always tend to se arate the conducting particles after the co ering action has ceased so as to de-cohere the same in afsim 1e and automatic -manner; Any other e astic substance may be substituted for the rubber, es-

pecially if it is non-conducting, and in fact the other }parts of the inventioncan-beused with a co er'ng material comprising a conducting substance, as for example, carbon 2 mixed with the metallic particles.

Capacities or rods 19 are shown extending vertically from the two brackets 11 and 12.

They are set at right angles to the axis of the coherer for greater efliclency. One extends upwardly and the other may extend either upwardly or downwardl While I have illustrated and described a preferred form of the invention and composition for a cohering material, I am aware that many mod ficati'ons may be I made therein fore, I do not'wish to be limited to the particular details shown and described, but

, What I do claim'is:-

without departing from the scope of the 1m, 7. vention as expressed in the claims. There- 1 1, A coherer comprising a fixed carbon disk or plate, an adjustable metallic plug, a rigid non-conducting glass, cylinder-or tube on the plug projecting beyond the end there'- of, and reslhent means for forcing the end of the tube against the disk.

pilate, an

for forcing they end of the tube against 4. A coherer'comprising a conducting disk 1 lug, a non-conducting cylinder or tube on tfie lug projecting beyond the end thereof, resi 'ent means for 'forcin the end of the tube against the disk, and co ering material between the disk and the end of the plug com rising zinc and elastic non-conducting partic es.

' 5. A coherer comprising a metal electrode,

I afcarbon electrode, and a cohering material comprisin a mechanical mixture of loose dry zinc and e astlc non-conducting particles.

6Q A coherer having a. cohering materiel comprising a mecham zinc and elastic non- 7 A col lerer terial cons1st1ng con ducting comprismg a c0 of a. mechamcal cal mlxture of-lopse dry fiartlcles.

el ing mamlxture of loose dry zinc and rubber articles.

In testimony whereof I ave hereunto set my nand, in the presence of two subscribing 4 CHAS. G. SARGENT, WM. F. SARGENT. 

